<?php
/**
 * Slipstream :: Highly adaptive dependency injection framework
 * Copyright 2010-2011 Ian Unruh (Xerof3ar)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
namespace Slipstream;

use LogicException;

use Slipstream\Activation\ActivatorInterface;
use Slipstream\Activation\SessionFactoryInterface;
use Slipstream\Configuration\BaseContext;
use Slipstream\Configuration\ContextInterface;
use Slipstream\Extension\BaseRegistry;

/**
 *
 *
 * @author Ian Unruh (Xerof3ar) <ianunruh@gmail.com>
 * @since Class avaliable since release 1.0
 */
class BaseContainer implements ContainerInterface
{
	/**
	 * @var ActivatorInterface
	 */
	protected $activator;
	
	/**
	 * @var RegistryInterface
	 */
	protected $extensionRegistry;
	
	/**
	 * @var ContextInterface
	 */
	protected $rootContext;
	
	/**
	 * @var SessionFactoryInterface
	 */
	protected $sessionFactory;
	
	/**
	 * Class constructor
	 * @return void
	 */
	public function __construct()
	{
		$this->extensionRegistry = new BaseRegistry($this);
		$this->rootContext = new BaseContext('root');
	}
	
	/**
	 * Activates an instance using a given identifier using the root context
	 * as the parent to the target context
	 *
	 * @param string $identifier
	 * @return object
	 */
 	public function getInstance($identifier)
	{
		return $this->getInstanceByContext($identifier, $this->rootContext);
	}
	
	/**
	 * Activates an instance using a given identifier using a given context
	 * as the parent to the target context
	 *
	 * @param string $identifier
	 * @param ContextInterface $context
	 * @return object
	 */
	public function getInstanceByContext($identifier, ContextInterface $context)
	{
		$session = $this->sessionFactory->createSession($identifier, $context, $this);
		
		$this->extensionRegistry->onSessionStart($session);
		$this->activator->activate($session);
		$this->extensionRegistry->onSessionFinish($session);
		
		return $session->getInstance();
	}
	
	/**
	 * Returns the extension registry for this container
	 * @return RegistryInterface
	 */
	public function getExtensionRegistry()
	{
		return $this->extensionRegistry;
	}
	
	/**
	 * Returns the root policy context for this container
	 * @return ContextInterface
	 */
	public function getRootContext()
	{
		return $this->rootContext;
	}
	
	/**
	 * Sets the activator for this container
	 *
	 * @param ActivatorInterface $activator
	 * @return void
	 */
	public function setActivator(ActivatorInterface $activator)
	{
		$this->activator = $activator;
	}
	
	/**
	 * Sets the session factory for this container
	 *
	 * @param SessionFactoryInterface $sessionFactory
	 * @return void
	 */
	public function setSessionFactory(SessionFactoryInterface $sessionFactory)
	{
		$this->sessionFactory = $sessionFactory;
	}
	
	/**
	 * Initializes the component
	 * @return void
	 */
	public function initialize()
	{
		$this->extensionRegistry->onContainerInitialize();
	}
	
	/**
	 * Shuts down the component
	 * @return void
	 */
	public function shutdown()
	{
		$this->extensionRegistry->onContainerShutdown();
	}
}